Trolley-head.



-BATENTED ua-R15, i907. o. HUPPMANN.

TROLLBYHEAD.

APPLICATION FILED AUG. 22fl905.

2 SHEETS-SHEET I1.

f" ,a I

PATENTED JAN. 15, 1907.

O. HFFMANN. TROLLEY HEAD, APPLIOTION llmumjzz.1905.Vl

2 SHEETS-SHEET 2.

OTTO HOFFMANN, OF BERLIN, GERMANY. TROLLEY-HEAD.

To tZZ whom it may concern:

Be it known that I, OTTO HOFFMANN, technical manager, a subject of the King of Prussia, German Emperor, residing at Grrossev Frankiurterstrasse 1G, Berlin, O., in the Province of Brandenburg, Kingdom of Prussia, and Empire of Germany', have invented new and useful Improvements in Trolley-Headset which the following is a Specification.

This invention has for its object acurrenttaker or trolley for electric railways and the like, having two rollers simultaneously in contact with the overhead wire, in'which any Slipping O' 01 springing oil' is prevented by a spring-yoke inclosing the conducting-wire after the manner of a clamp, being Vand arranged round the lordinary trolleyfroller and pivoted on the axis ofthe roller. .The free aperture of this yoke for the reception of the wire has the saine or approximately the same section as the wire, and is held in the correct position relative to the wire by meansof an auxiliary roller mounted thereon.

ln order to more particularly describe the invention, reference is made .to the accompanying drawings, in which- Figure l is a side view of the ourrenttaker or trolley with a low-lying overhead wire; Fig. 2, a side view with a higher overhead wire. F ig. 3 shows the connection of the fork with the frame formed of side bars. Fig. 4 is a top view of the current-taker when traveling round a particularly sharp curve of the conductor, and, finally, Fig. 5'is a view of the current-taker seen from below.

The two side parts a of the clamp-like yoke are connected by a screw d and releasably and revolubly mounted by means or' slots between the main roller I) and the fork c on the aXle it of the main roller b, while two springs h, arranged in lugs g and acting on set-pins e, produce the spring action of the yoke, which is held inea suitable position relative to the conducting-wire by a guide-roller f, mounted between the side bars. The clamp-like yoke thus formed by the two sido bars c, may, as shown more particularly in Fig. 3, when the rear part has been turned upward be pushed down lbetween the main roller b and fork c up to the bushes i of the main roller-axle c. Elf then the yoke be turned down to 'the right, the projections Z come into action and are guided by means of the two lower edges m of the fork c ina course concentric to the main roller b, and

Specification of Letters Patent. Application nea August 22.1906. serai 110.275.213.

Patentedv Jan. 15, 1907.

I thereby secure a lattachment ot the clamp-like yoke on `the forkl c. After the in sertion ofthe yoke the two springs h are attached to the hooks n on the forked projection o. `In this waythe vyoke is connected elastically and pivotally with the fork. These arrangements for the easy removaloiv the yoke are employed in order to allow it to be easily cleaned and oiled and any yokesl which have become defective by use to .be

easily replaced by fresh' ones without long in-l terruption ofthe working.

l/Vhen in use with ovehead wires of known form, the two outer sides of the clamp-like yoke formed by the side bars a allow of the 'trolley being carried through safety devicesfor in stance, guide-bars or the like-mounted on the upper wire .for preventing the Ordin aryY trolley, only consisting of roller and fork, vfrom slipping ofi at curves and crossings. For this object the yoke must have about the same width as the contact-roller of the ordinary current-taker hitherto utilized for eX- isting overheadfwires; Y Shouldersor jaws p, Fig. 4, between which a free space is left, the clearwidth of which spacev is eXactlyas large or only slightly larger than the diameter-of the traveling wire, are provided on the sidebars a, so that the wire is absolutely held fast on a curve, as in a clamp, ybecause in this case the free space or section is smaller than the 'corresponding oblique sectiony of the wire. The shoulders p form, together with the recessed Ymain roller b, an open space of oval form round the conducting-wire, through which space the wire slides, (hiring working being almost cornpletely secured. against springing out .on straight as well as curved stretches. It can, in fact, only spring out if it should happen that the wire should coincide 1nathematically exactly with the opening between thejaws. W'hen the roller is to be placed against the wire, the edges of the shoulders p must be parallel withthe axis of the wire. In order' to facilitate the entrance of the conductor-wire through the opening., bevel ings are formed on the upper parts oi the side jaws, while by means of a spring member t, formed on the fork-shaft, 4permitting lat` eral movement, the' trolley may be placed loo against the wire when the overheadjwire is in i a Yposition inclined to the roller. The side jaws are beveled off to the front and the rear in order, on the onehand, to ,allow of the suspension-lugs g, which connect the :king wire 1 and the support-Wires s, even .o oase o1 'very rapid traveling, to slip ,f through the longitudinal opening, and, ne other hand, to facilitate secure traveling round ourves. The side jaws may also bold apart by the yoke and be provided with linked strongly inward springing deparallel to the axis oi thev Workingwire in der to alloy; any .intermediate pieces of larger section .existing in the Wire to also passA through.

' Tile gnide-rollerf and the two springs h for 'their common ob}ect toA maintain tire ola'npdike yoke', above described,l always in 'site same relative position to the overhead Wire, Whether the Wire be placed high or low.

The springs on tlie vehicle which press the ro`le ypole with the current-taker against must be so powerful tliat the power rings h, arran ed on the side bars a, overcome an a constant and univing now particularly described and asnerl-ained the nature or my said invention vided with slots adapted to iit the axle of said` current-taking Wheel, spring-operated means for holdingsaid slots in position on said axle, and means for limiting;v the movement of said yoke. l

3. In a trolley-head, the combination of a forked member pivotally mounted on a suit able ole, a trolley-wheel mounted insaid forked member, a clamp-like yoke rovided with slots adapted to fit upon the ax e of said trolley-Wheel, an auxiliary Wheel mounted in said yoke, springs connected to said yoke and said forked member andlugs on seid yoke adapted'to engage said forked member.

4. In a trolleyhead,tl1e combination of a forked member ivotally mounted on a. suitable pole, a tro ley-wheel mounted on said forked member, a yoke comprising tWo members, each member being provided with a downwardly-open slot adapted to fit upon the axle of'said trolley-Wheel, an`auxil1ary Wheel mounted in said'yoke, rejections on said forked member, springs etachably se* cured to said projections and to said yoke and lugs on. said yoke adapted to engage said forked member.

5. Ina device of the character described, the combination of a forked member pivotallyvmo'unted on a suitable support, a trolley-Wheel mounted therein, a yoke provided with slots adapted to restupon and partly surround the axle of said' trolley-Wheel, springs for maintainingsaid slots in position on said axle, andv means for limiting the movement of'said yoke.

oT'ro HoriuiANN.

Witnesses: I

WOLDEMAR HAUPT, PAUL RoLLr. 

